<template>
  <div class="upload-file">
    <el-upload multiple :action="uploadFileUrl" :before-upload="handleBeforeUpload" :file-list="fileList" :limit="limit"
      :on-change="handleChange" :on-error="handleUploadError" :on-exceed="handleExceed" :on-success="handleUploadSuccess"
      :show-file-list="false" :headers="headers" class="upload-file-uploader" ref="upload" :auto-upload="true"
      style="display: inline-block" :disabled="disabled" :fileType="fileType">
      <!-- 上传按钮 -->
      <el-button type="primary" :disabled="disabled">选取文件</el-button>
      <!--<el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传到服务器</el-button>-->
    </el-upload>
    <!--<el-button style="display: inline-block;float: right;" type="success" @click="submitUpload">上传到服务器</el-button>-->
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
      的文件
    </div>
    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
      <el-row class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList" :key="file.uid"
        :gutter="20">
        <el-col :span="20" :ref="`col${index}`">
          <div>
            <el-tooltip :content="file.name" :disabled="!overflowDisabled[index]">
              <el-link @click="handleDownload(file)" :underline="false" target="_blank" :ref="`name${index}`"
                :class="[overflowDisabled[index] ? 'isToolTip' : '']">
                <span class="el-icon-document" :style="{ width: overflowWidth }">{{ getFileName(file.name) }} </span>
              </el-link>
            </el-tooltip>
          </div>
        </el-col>
        <el-col :span="4" class="ele-upload-list__item-content-action">
          <el-link :underline="false" @click="handleDelete(index, file)" type="danger" :disabled="disabled">删除</el-link>
        </el-col>
      </el-row>
    </transition-group>
  </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";
import { upLoadFile, downLoadFile, deleteFile } from "@/api/system/attachFile";
import { nextTick } from "vue";

const props = defineProps({
  modelValue: [String, Object, Array],
  // 数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 100,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    //default: () => ["doc", "xls", "ppt", "txt", "pdf"],
    default: () => [],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  disabled: {
    type: Boolean,
    default: false
  },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadFileUrl = ref(import.meta.env.VITE_APP_BASE_API + "/attachment/uploadFile"); // 上传的图片服务器地址
const headers = ref({ token: "token " + getToken() });
const fileList = ref([]);
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize)
)

const overflowWidth = ref('')
const overflowDisabled = ref([])
const toolTipWidth = () => {
  nextTick(() => {
    overflowWidth.value = ''
    overflowDisabled.value = []
    fileList.value.map((item, index) => {
      let curVal = proxy.$refs[`col${index}`][0].$el.offsetWidth < proxy.$refs[`name${index}`][0].$el.offsetWidth
      overflowDisabled.value.push(curVal)
      if (curVal) {
        overflowWidth.value = proxy.$refs[`col${index}`][0].$el.offsetWidth + 'px'
      }
    })
  })
}

watch(() => props.modelValue, val => {
  if (val) {
    let temp = 1;
    // 首先将值转为数组
    const list = Array.isArray(val) ? val : props.modelValue.split(',');
    // 然后将数组转为对象数组
    fileList.value = [...list.map((item, index) => {
      if (typeof item === "string") {
        item = { name: item, url: item };
      }
      item.uid = item.attachId || new Date().getTime() + temp++;
      item.name = item.attachName;
      item.url = item.attachPath;
      return item;
    })]
    toolTipWidth()
  } else {
    fileList.value = [];
    overflowWidth.value = ''
    return [];
  }
}, { deep: true, immediate: true });

// 上传前校检格式和大小
function handleBeforeUpload(file) {
  // 校检文件类型
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    const isTypeOk = props.fileType.some((type) => {
      // if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
    if (!isTypeOk) {
      proxy.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join("/")}格式文件!`);
      return false;
    }
  }
  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  if (file.size == 0) {
    proxy.$modal.msgError(`上传文件大小不能为空！`);
    return false;
  }

  proxy.$modal.loading("正在上传文件，请稍候...");
  number.value++;
  return true;
}


function handleChange(file, fileList) {
  fileList.value = fileList;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传失败
function handleUploadError(err) {
  proxy.$modal.msgError("上传文件失败");
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  uploadList.value.push({ attachId: res.data[0].attachId, name: res.data[0].attachName, url: res.data[0].attachPath });
  if (uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    //emit("update:modelValue", listToString(fileList.value));
    proxy.$modal.closeLoading();
    proxy.$modal.msgSuccess("上传文件成功");
    emit('uploadFile', res.data[0].attachId);
    emit('uploadSuccess', res.data);
  }
}

// 删除文件
function handleDelete(index, file) {
  fileList.value.splice(index, 1);
  emit('delFile', '');
}

// 下载文件
function handleDownload(file) {
  var query = {
    attachId: file.attachId,
    name: file.attachName
  }
  location.href = import.meta.env.VITE_APP_BASE_API + "/attachment/downLoadFile?attachId=" + encodeURIComponent(query.attachId);
}

// 获取文件名称
function getFileName(name) {
  return name
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url) {
      strs += list[i].url + separator;
    }
  }
  return strs != '' ? strs.substr(0, strs.length - 1) : '';
}

//上传附件
function submitUpload(id) {
  if (fileList.value.length === 0) {
    proxy.$modal.msgWarning("请选取文件");
    return
  }
  const formData = new FormData()
  // 因为要传一个文件数组过去，所以要循环append
  fileList.value.forEach((file) => {
    formData.append('file', file.raw)
  })
  upLoadFile(formData).then(res => {
    if (res.code == 200) {
      proxy.$modal.msgSuccess("上传文件成功");
    } else {
      proxy.$modal.msgError("上传文件失败");

    }
  });
}
defineExpose({
  fileList
});
</script>

<style scoped lang="scss">
.upload-file {
  width: 100%;
}

.upload-file-uploader {
  margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}

.upload-file-list {
  .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;

    :deep(.el-link) {
      .el-icon-document {
        display: inline-block;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
      }

      &.isToolTip {

        .el-link__inner {
          justify-content: left;

          .el-icon-document {
            width: v-bind(overflowWidth);
          }
        }
      }
    }

    .ele-upload-list__item-content-action {
      :deep(.el-link) {

        .el-link__inner {
          justify-content: inherit;
        }
      }
    }
  }
}
</style>
